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Attic Temperature

  • Mark W 

The attic temperature was way too hot.

  1. Why do you have a hot attic?
  2. Why is your house getting hot?
  3. Why does your AC run all the time?
  4. What do you do to reduce the heat in the attic?

We had a situation where our house was made out of blocks, which is excellent for hurricanes or tornadoes. But not so great for temperature going up and down.

1. The attic is well insulated, to the recommendation of the contractor and the insulation company. But yet, when it is 60° outside, our house would be 78° inside. So we would have to turn on the AC to get the temperature down to a bearable 72°. Of course, reducing attic temperature would help.

Radiant heat is beating on your roof all day. Which gets in your attic and into the insulation you have. The heat gets trapped inside the attic, yes you have vent holes on your to help relieve the heat. They use the old method of heat rise and going out of the vent. Still, there is a lot of heat left in the attic and insulation.

Attic Temperature
Attic Temperature

2. The heat from the attic gets the insulation hot. Some believe if I have good insulation my house will stay comfortable. That is far from the truth.

See the radiant heat works its way into the insulation. Insulation traps the heat and the heat tricks it way into your living space. Which makes your living space hot.

3. That means that AC runs a lot, especially at the beginning of spring and the end of winter when the temperature fluctuates during the day and at night.

It became costly for us to run the AC. He would need it in the morning because it would be too cool. And in the afternoons, we would need to run it. Because of the temperature in our home got about 78° even though the high temperature outside was 72°.

Continuous switching of the thermostats up and down, up and down made the utility bills go up, because of temperature regulation. You can’t leave the AC on at night because you take a chance of freezing up the HAVC system. After all, it’s 30° outside.

So we would wait until mid-afternoon, and when I got to round 78 inside, between 60 and 70 outside. Then we would turn on the AC thermostat, and it ran a long time to get the temperature inside down to 72°.

Attic Temperature, Rolling Barrier Out Onto Insulation
Attic Temperature

4. So we looked at the radiant barrier, and it would reduce the attic temperature and we decided to install it, so we did. We didn’t put it up the roof joist. We laid it over the insulation itself and stapled it where we could. Some are just lying there.

Now remind you we use about 1000 ft.² of the product. It covered the whole attic far as the floor deck and the decking inside the garage. There was no insulation in the garage at all.

The day we put the radiant barrier in, the temperature inside was within 4° degrees of the temperature outside. The windows were open, and the front door was open. The sliding glass door was open.

Before we would have the windows open in the door openers, a glass door open with the screenshot, and it would get up to 78° in the afternoon. This time it stabilized within about 4°

We noticed that the temperature stayed the same within a couple of degrees of each other, so the radiant barrier was doing what it was designed to do. It kept insulation cool and wouldn’t allow it to heat up as much, which in return did not trickle down into your living space.

In which in return, we were able to enjoy a comfortable atmosphere temperature-wise. We won’t have to turn on AC. We haven’t turned on the AC for over a week, which is enormous, we can’t wait to see what it will do when it gets 90° or even 95° outside.

See if we can’t reduce the usage of the AC unit in months to come? I’m sure by our results so far that we will not have to run it so much we will not have to run itself so much for the regulation of the temperature we desire we said in a home which is 72°.

So that being said, radiant barrier plus works it does what is supposed to keep the Attic Temperature, and insulation cool, and therefore, you have a more comfortable home you don’t have to run the AC so much. It’s like almost throwing a considerable size shade tree over your house.

What is the acceptable attic temperature?

In the hot summer months between 70 and 80 degrees.

How much hotter is an attic than the outside?

At 80 degrees outside it could get up to 130 in the attic.

How hot can an attic get on a 100-degree day?

It could get 140 to 180 degrees.

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